Blind stitch sewing machine



J. OBRIEN BLIND STITCH SEWING MACHINE Dec 8, 19 1.

Filed Jan. 5. 1929 2 Sheets-Sheet l 8, 1931; J. OIBRIEN 1,835,959

BLIND STITCH SEWING MACHINE Filed Jan. 5, 1929 2 Sheets-Sheet 2,livewzfor: Jasgpkli. Ozriew,

Patented Dec. 8, 1931 UNITED STATES JOSEPH L. OBRIEN,=0F EAST NORWALK,

PATENT OFFICE couunc'rrcu'r, ASSIGNOR TO THE cnorui'r 4ND KNAPP ('20.,OF NEW YORK, N. Y., A CORPORATION OF CONNECTICUT BLIND STITCH SEWINGMACHINE Application filed January 5, 1929. Serial 1101330562. I

The present inventionrelates to improvements in sewing machines, and hasparticular reference to the work guiding devices for blind stitch orother'types of machines used for sewing tape over the reverse side ofseams between two adjacent pieces of cloth.

When two pieces of goods are sewed to? gether'in the conventionalmanner, the outside of the resulting seam presents a smooth, evenappearance, showing only a singleline of attachment, whereas the reverseside shows also the two adjacent edges of the pieces joined. The edgesofthe cloth may or may not be ragged: and uneven but in either case thereverse side presents an unsightly appearance, and accordinglymanufacturers of quality articles conceal it by suitable-linings, or bymeans of relatively narrow pieces of tape running lengthwise with theseam,and of sufficient width to completely'cover and conceal the same.This is particularly true in the case of garments such ascaps, or coats,in-which the reverse sides of seams are frequently exposed to view. v 7

One method of attaching such concealing tape is to lay'it over thereverse side of the seam and then run a line of stitching ad: jacenteach edge of the tape and along its entire length, the stitchingextending through the tape and the cloth to which is attached and beingexposed on both sides. Such an operation may readily be accomplished onan ordinary type of sewing machine without difliculty but the resultingproduct is somewhat objectionable, for while the appearance of thereverse side has been improved, that of the outside has been materiallydepreciated owing to the exposed lines of'stitching. v p I The mostadvantageous results are there fore obtained where the tape isblindstitched to the reverse side ofthe cloth so that the attaching lines ofstitching willnot be visible from the outside of the material.

There are numerous blind stitch sewing machines in use at the presenttime and in practically all such machines the material is made to travelat an angle to the needle path. I That is, the material'is' not feddirectlyin alignment with the position of the presser foot onthejniachine, but at an inclination to it, and it is therefore essentialthat eifective means to mechanically guidethe material be provided,since the operator cannot align itv with the machine by eye.

- Great difficulty has been heretofore experienced in the provision ofguiding means which will accurately position the seamed material andtape in proper relativefiired relation during the blind stitchingoperation of anarrow'tape to the reverse side-of a seam.

Due tothe nature of the operation, the guiding must be extremelyaccurate'an-d means must be provided to not only guide the inaterialwhile the first line of stitchingis bemg applied to the tape, but alsowhilethe second line is beingapplied.

' It is a general object of the present in;

vention to provide an attachment for a blind stitch sewing'machine bymeans of which the blind stitching of tape onthe reverse slde of a seammay be readily efiected;

Another object of the invention is the pro vision of a "presser'foothaving a tape duct provided with two guide members attached thereto.

These and. other objectsof the'invention will become more readilyapparent upon a detailed study of the specification when read inconnection with the accompanying drawings and will be pointed out in theappended claims. I Fig. 1 is a side elevation in part of amachineembodying the improvements of my invention. v

Fig. 2is a front elevation showing a fragmentary view of the presserfoot and some of the adjoining parts shown injFig. 1.

Fig. 3 is a top'plan vie-w foot shown in Fig. 2. V f FigJl'is a bottomplan view of thepress'er .oot. i

Fig. 5 is a fragmentary plan view showing the position of the tape ductand guide members when the first line of stitching is applied tothetape.

of the presser shown in- Fig. 5.

Fig. 7 is a plan view showing the position of the tape duct and guidemembers when iii the second line of stitching is applied to the tape.

Fig. 8 is a sectional View of a seam hav-- ing a tape applied to itsreverse side.

Fig. 9 is a fragmentary sectional View of the presser foot and plunger,immediately prior to the insertion of the needle.

Fig. 10 is a similar View showing the needle inserted.

In the drawings, lO indicates generally the stitch forming' mechanismabove the presser foot and 11 designates the work handling mechanismbelow the presser foot; No

attempt will be made to describe these me-ch anisms in detail as theyform no part of the are toe portions 16 and 1'2. between which issituated the cloth recess 18 through which the material is adapted to beraised by the plunger 19 of the work handling mechanism soas toforrn abend as shown in Fig. 10.

Attached to the toe portion 16 of the presser foot by means of the screw20 is the needie deflector 21 and the usual guide 22 which is of lightspring construction and of the type ordinarily employed on an ordinary'presser foot.

The present invention contemplates the provision of novel tapepositioning and guiding means, and the construction, function andoperation of such means will now be described.

Fastened preferably by soldering to the bottom of the needle deflector21 is a tape duct'23' having guide members 24 and 25 runninglongitudinally therewith at its forward portion and extending somewhatbe yond the end of the tape duct. The two guide members are preferablyformed of one piece, of which the central portion 26 is fastened in anysuitable manner to the bottom of the tape duct. and the end portions arebent at right angles to form the guide members as shown in F ig. 6.

The tape duct is'positioned adjacent to and in alignment with the edgeguide 22 and extends preferably from the outer end of the needledeflector 21 to a point approximately midway to'the icloth recess 18.

The edge guide 22 is positioned in align nent with the center ofthecloth recess 18 in order that the edge to be guided will pass directlyover the path of the plunger 19 of the work handling mechanism. 'This isessential as the plunger 19 and needle 27'- cooperate with the looper(not shown) to form the lines of stitching which should be along theedge of the material sewed.

As the material passes over the plunger 19 it is pushed upward into thecloth recess 18 of the presser foot by the action of the plunger, andthe bend thus formed is penetrated by the needle 27 as shown in Figs. 9and 10. The needle passes entirely through the upper portion of thecloth 28. It enters the tape 29 at only one point for each stitch, andemerges from the material 28 at a point outside the e e of the tapebefore being withdrawn along the arcuate path it follows. Exact guidingis essential since otherwise the needle might miss the tape entirely ifit were not imperfect-alignment. 1 i f Since the tape duct is positionedimmediately adjacent the edge guide 22, one-edge of thetapepassingthrough the duct will necessarily pass over the center ofthecloth recess 18 and always be opposite the point of theplunger 19.

The operation of the device is as follows [The seamed-material 2-8 islaid on the work plate or table SO and made to pass between the presserfoot and stitch forming mechanism, and the work handling mechanism.

The material is positioned by the operator so that the guide member 24.engages the seam as shown in Figures5 and 6. Tape 29 is passed throughthe tape duct 23-and moved in the direction of the arrow, as thematerial-28 is moved in the same direction by the work handlingmechanism 11., and the stitch forming mechanism begins the first line ofstitching. The tape duct'and guide members are stationary,- since theyare attached to the presser foot, and the material 28 is consequentlyheld in true alignment by action of the guide member, 24- in the seam,and (tihe tape 29 is held in true alignment by the uct. y

After thefirst line of stitching has been applied to the -tape along theentire seam to he covered, the tape is cut from the reel, and thematerial is removed from the machine and turned so that the unsewn edgevof the tape is in alignment with guide 25 as shown in Fig. 7. Guide 25of the tape duct is in alignment with edge guide 22 so that as thematerial is again fed into the machine, the

unsewn edge is directed over the center'of' the plunger path forstitching by the needle and looper asthe tape passesunderthe tape duct.

Having thus described my invention; what I claim as newand desire tosecure by Letters Patentof the United States is as follows: w p v 1.. Ina blind stitch sewing machine, a presser foot having a cloth recessadapted to have a bend of cloth and tape projected therethrough, meansfor conducting the edge Of a length of tape over the center of saidcloth recess, and guide members integral with said tape conductingmeans.

2. In a blind stitch sewing machine, a presser foot having a clothrecess adapted to have a bend of cloth and tape projected therethrough,a tape duct, and a guide member positioned on said tape duct.

3. In a blind stitch sewing machine, a presser foot having a clothrecess adapted to have a bend of cloth and tape projected therethrough,a tape duct having one edge thereof in alignment with the center of saidcloth recess, and guide members positioned beneath the tape duct.

4. In a blind stitch sewing machine, a

presser foot having a cloth recess adapted to have a bend of cloth andtape projected therethrough, a tape duct having one edge thereof inalignment with the center of said cloth recess, and guide memberspositioned beneath the tape duct, said tape duct being disposed at anangle to the axis of the presser foot, said guide members runninglongitudinally of the tape duct.

5. In a blind stitch sewing machine, a presser foot having a needledeflector and edge guide attached thereto, a tape duct secured to thebottom of said needle deflector, I and guide members secured to the tapeduct,

said tape duct being positioned to have one edge adjacent and parallelto the edge guide. 6. In a blind stitch sewing machine, a

presser foot having a needle deflector and,

edge guide attached thereto, a tape duct adjacent and parallel to saidedge guide attached to the needle deflector, a guide member attached tosaid tape duct, and a second guide member parallel to the first saidguide member, the first said guide member being disposed under andparallel to an edge of the tape duct, the second guide member beingdisposed approximately under the center of said tape duct.

In testimony whereof, I have hereunto set my signature.

JOSEPH L. OBRIEN.

